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<h2><a name="_Toc226183876">SYSTEM Type = UVT</a></h2>
<p class="BodyTextArialBold">Unit Ventilator</p>
<p class="MsoBodyText">This simulation is for a unit ventilator serving one zone.
Therefore, entering multiple zones assigned to one system is simulated as a
zonal system with one unit ventilator in each zone. This unit was used almost
entirely in school classrooms prior to the accepted practice of air conditioning
schools. The transition to air conditioning was made by adding a cooling coil;
however, this type of unit ventilator with a cooling coil is not available.
(Use SZRH or PSZ serving multiple zones of similar use for this application.)
The unit consists of an economizer damper, air filter, fan and heating coil
which may be hot-water, steam, electric coil or furnace. <font style="background-color: rgb(49, 106, 197);" color="#ffffff">Fin tube radiation</font> is
often installed on each side of the unit ventilator to blanket the windows with
warm air. The <font style="background-color: rgb(49, 106, 197);" color="#ffffff">radiation</font> is usually controlled using an outdoor reset and
is operative nights and weekends to hold minimum night temperatures. Optionally,
the <font style="background-color: rgb(49, 106, 197);" color="#ffffff">radiation</font> may
be thermostatically controlled, riding in parallel with the unit heating coil
even when the fan is on.</p>
<p class="MsoBodyText"> </p>
<p class="Picture"><img src="../ImagesExt/image14_65.png"></p>
<p style="margin-left: 0pt;" class="MsoCaption">Figure 67 Unit ventilator</p>
<p class="BodyTextArialBold">Other names and/or applications for UVT </p>
<p class="MsoBodyText">The UVT system is seldom applied for applications other
than schools. Also note that the HVSYS system is a central ventilation system
that is also a school system.</p>
<p class="BodyTextArialBold">Standard Temperature Controls</p>
<p class="MsoBodyText">The unit ventilator control is nearly the same as that for
large systems. On a rise of temperature in the classroom, the heating coil
modulates closed but only to the point that the supply air temperature does not
fall below the minimum of approximately 55F. On a further rise of space
temperature the economizer modulates to full open with a limit of 80F to 90F, at
which point the outside damper returns to its minimum position. The outside air
damper is closed, whenever the fan is off, on nights and weekends. In very cold
climates the fan cycles on to hold the night setback; however, the <font style="background-color: rgb(49, 106, 197);" color="#ffffff">fin tube radiation</font>
normally is sufficient for this purpose.</p>
<hr noshade size="1">
<p class="RelatedHead">Subtopic help for this Topic:</p>
<p class="MsoNormal"><a style="text-decoration: none;" href="javascript:RT_2930.HHClick()"><img alt="" src="../button.gif" align="absMiddle" border="0">Input template for a standard UVT unit</a></p>
<p class="MsoNormal"><a style="text-decoration: none;" href="javascript:RT_6095.HHClick()"><img alt="" src="../button.gif" align="absMiddle" border="0">Covered in detail by separate Topics are the following:</a></p>
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<object id="RT_6095" classid="clsid:adb880a6-d8ff-11cf-9377-00aa003b7a11" type="application/x-oleobject"><a style="text-decoration: none;" href="javascript:RT_6095.HHClick()"><param name="Width" value="106"><param name="Height" value="53"><param name="Command" value="Related Topics"></a></object></div>
</div><br><br><div class="gmail_quote">On Fri, Jul 30, 2010 at 7:39 AM, Ben Pressman <span dir="ltr"><<a href="mailto:bpressman@practicalenergy.net">bpressman@practicalenergy.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
I am a relative newcomer to eQuest, trying to model a 1970's school building with several different HVAC systems. Much of the building is served by natural convection finned radiators receiving hot water. The water runs through a heat exchanger with steam from the central boiler. There is no forced air, no furnace, and no ventilation, so it's not an air-side system. How do I model this?<br>
<br>
Thanks,<br>
Ben<br>
<br>
-- <br>
Ben Pressman<br>
Project Engineer<br>
Practical Energy Solutions<br>
770 E Market Street, Suite 250<br>
West Chester, PA 19382<br>
ph 610.430.1382<br>
cell 610.733.9518<br>
web <a href="http://www.practicalenergy.net" target="_blank">www.practicalenergy.net</a><br>
<br>
<br>
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</blockquote></div><br><br clear="all"><br>-- <br>Carol Gardner PE<br>
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